56070 Federal Register / Vol. 71, No. 186 / Tuesday, September 26, 2006 / Proposed Rules 

Issued in Renton, Washington, on 

September 14, 2006. 

Kalene C. Yanamura, 

Acting Manager, Transport Airplane 

Directorate, Aircraft Certification Service. 

[FR Doc. 06–8232 Filed 9–25–06; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2006–25904; Directorate 

Identifier 2006–NM–077–AD] 

RIN 2120–AA64 

Airworthiness Directives; Bombardier 

Model DHC–8–100, –200, and –300 

Series Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), Department of 

Transportation (DOT). 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: The FAA proposes to 

supersede an existing airworthiness 

directive (AD) that applies to certain 

Bombardier Model DHC–8–100, –200, 

and –300 series airplanes. The existing 

AD currently requires modification of 

the flight compartment door; repetitive 

inspections for wear of the flight 

compartment door hinges following 

modification; and repair or replacement 

of the hinges with new hinges if 

necessary. This proposed AD would 

require using revised procedures for 

modifying and inspecting the flight 

compartment door and would reduce 

the applicability of the existing AD. 

This proposed AD results from a 

determination that certain cockpit doors 

are no longer subject to the existing 

requirements. We are proposing this AD 

to prevent failure of the alternate release 

mechanism of the flight compartment 

door, which could delay or impede the 

evacuation of the flightcrew during an 

emergency. This failure also could 

result in the flightcrew not being able to 

assist passengers in the event of an 

emergency. 

DATES: We must receive comments on 

this proposed AD by October 26, 2006. 

ADDRESSES: Use one of the following 

addresses to submit comments on this 

proposed AD. 

• DOT Docket Web site: Go to http:// 

dms.dot.gov and follow the instructions 

for sending your comments 

electronically. 

• Government-wide rulemaking Web 

site: Go to http://www.regulations.gov 

and follow the instructions for sending 

your comments electronically. 

• Mail: Docket Management Facility; 

U.S. Department of Transportation, 400 

Seventh Street, SW., Nassif Building, 

Room PL–401, Washington, DC 20590. 

• Fax: (202) 493–2251. 

• Hand Delivery: Room PL–401 on 

the plaza level of the Nassif Building, 

400 Seventh Street, SW., Washington, 

DC, between 9 a.m. and 5 p.m., Monday 

through Friday, except Federal holidays. 

Contact Bombardier, Inc., Bombardier 

Regional Aircraft Division, 123 Garratt 

Boulevard, Downsview, Ontario M3K 

1Y5, Canada, for service information 

identified in this proposed AD. 

FOR FURTHER INFORMATION CONTACT: Ezra 

Sasson, Aerospace Engineer, Systems 

and Flight Test Branch, ANE–172, FAA, 

New York Aircraft Certification Office, 

1600 Stewart Avenue, Suite 410, 

Westbury, New York 11590; telephone 

(516) 228–7320; fax (516) 794–5531. 

SUPPLEMENTARY INFORMATION: 

Comments Invited 

We invite you to submit any relevant 

written data, views, or arguments 

regarding this proposed AD. Send your 

comments to an address listed in the 

ADDRESSES section. Include the docket 

number ‘‘Docket No. FAA–2006–25904; 

Directorate Identifier 2006–NM–077–

AD’’ at the beginning of your comments. 

We specifically invite comments on the 

overall regulatory, economic, 

environmental, and energy aspects of 

the proposed AD. We will consider all 

comments received by the closing date 

and may amend the proposed AD in 

light of those comments. 

We will post all comments we 

receive, without change, to http:// 

dms.dot.gov, including any personal 

information you provide. We will also 

post a report summarizing each 

substantive verbal contact with FAA 

personnel concerning this proposed AD. 

Using the search function of that Web 

site, anyone can find and read the 

comments in any of our dockets, 

including the name of the individual 

who sent the comment (or signed the 

comment on behalf of an association, 

business, labor union, etc.). You may 

review the DOT’s complete Privacy Act 

Statement in the Federal Register 

published on April 11, 2000 (65 FR 

19477–78), or you may visit http:// 

dms.dot.gov. 

Examining the Docket 

You may examine the AD docket on 

the Internet at http://dms.dot.gov, or in 

person at the Docket Management 

Facility office between 9 a.m. and 5 

p.m., Monday through Friday, except 

Federal holidays. The Docket 

Management Facility office (telephone 

(800) 647–5227) is located on the plaza 

level of the Nassif Building at the DOT 

street address stated in the ADDRESSES

section. Comments will be available in 

the AD docket shortly after the Docket 

Management System receives them. 

Discussion 

On March 30, 1999, we issued AD 99–

08–04, amendment 39–11109 (64 FR 

16803, April 7, 1999), for certain 

Bombardier Model DHC–8–100, –200, 

and –300 series airplanes. That AD 

requires modification of the flight 

compartment door; repetitive 

inspections for wear of the flight 

compartment door hinges following 

modification; and repair or replacement 

of the hinges with new hinges, if 

necessary. That AD resulted from a 

report that the door lock mechanism of 

the flight compartment door jammed 

and could not be opened using the 

alternate release mechanism. We issued 

that AD to prevent failure of the 

alternate release mechanism of the flight 

compartment door, which could delay 

or impede the evacuation of the 

flightcrew during an emergency. This 

failure also could result in the 

flightcrew not being able to assist 

passengers in the event of an 

emergency. 

Actions Since Existing AD Was Issued 

Since we issued AD 99–08–04, 

various civil aviation authorities have 

mandated the installation of reinforced 

flight compartment doors, which 

negates the need for the modification 

required by paragraph (a) of the existing 

AD (Modification 8/2337) for airplanes 

on which the doors were installed in 

production. Modifications 8/2228, 8/ 

2229, 8/2231, 8/2232, 8Q100859, 

8Q900267, 8Q420101, 8Q420143, 

8Q200131, or 8Q420440 are equivalent 

to Modification 8/2337 (specified in 

paragraph (a) of the existing AD) for the 

flight compartment door alternate 

release mechanism. In addition, 

Bombardier has issued revised 

procedures for modifying and 

inspecting the flight compartment door. 

Relevant Service Information 

Bombardier has issued Service 

Bulletin 8–52–39, Revision ‘‘H,’’ dated 

September 9, 2004. Revision ‘‘H’’ is 

similar to Revision ‘‘D,’’ dated February 

27, 1998, which was cited in the 

existing AD as the appropriate source of 

service information for accomplishing 

the required actions. Among other 

things, Revision ‘‘H’’ revises the 

procedures used for modifying and 

inspecting the flight compartment door, 


sroberts on PROD1PC70 with PROPOSALS
Federal Register / Vol. 71, No. 186 / Tuesday, September 26, 2006 / Proposed Rules 56071 

as specified in the original issue of 

Bombardier Service Bulletin 8–52–39, 

dated October 31, 1996, and Revision 

‘‘A,’’ of the service bulletin. In addition, 

the effectivity specified in Revision ‘‘H’’

excludes airplanes on which new, 

improved flight compartment doors 

have been installed in production. 

Transport Canada Civil Aviation 

(TCCA), which is the airworthiness 

authority for Canada, mandated the 

service information and issued 

Canadian airworthiness directive CF–

1996–20R4, dated August 10, 2005, to 

ensure the continued airworthiness of 

these airplanes in Canada. 

FAA’s Determination and Requirements 

of the Proposed AD 

These airplane models are 

manufactured in Canada and are type 

certificated for operation in the United 

States under the provisions of section 

21.29 of the Federal Aviation 

Regulations (14 CFR 21.29) and the 

applicable bilateral airworthiness 

agreement. Pursuant to this bilateral 

airworthiness agreement, TCCA has 

kept the FAA informed of the situation 

described above. We have examined 

TCCA’s findings, evaluated all pertinent 

information, and determined that AD 

action is necessary for airplanes of this 

type design that are certificated for 

operation in the United States. 

This proposed AD would supersede 

AD 99–08–04 and would retain the 

requirements of the existing AD, but 

would require using revised procedures. 

This proposed AD would also reduce 

the applicability of the existing AD. 

Operators should note that Note 2 of 

AD 99–08–04 provides credit for 

modification of the flight compartment 

door in accordance with Bombardier 

Service Bulletin S.B. 8–52–39, dated 

August 30, 1996; Revision ‘‘A,’’ dated 

October 31, 1996; Revision ‘‘B,’’ dated 

July 4, 1997; or Revision ‘‘C,’’ dated 

September 1, 1997; if the modification 

is done before the effective date of AD 

99–08–04. However, we have 

determined that the modification and 

inspection procedures specified in the 

original issue and Revision ‘‘A,’’ of the 

service bulletin are not adequate due to 

a design deficiency detected after 

issuance of those service bulletins. 

TCCA agrees with this finding. 

Accordingly, we have re-identified 

Note 2 of the existing AD as paragraph 

(i) of this proposed AD for formatting 

reasons. In addition, we have revised 

the content of the new paragraph (i) to 

remove references to the original issue 

and Revision ‘‘A’’ of the service 

bulletin, and to provide credit for 

accomplishing the actions in Revision 

‘‘E,’’ dated May 10, 1999; Revision ‘‘F,’’

dated February 4, 2000; or Revision G, 

dated May 17, 2001. 

Clarification of Alternative Method of 

Compliance (AMOC) Paragraph 

We have revised this action to clarify 

the appropriate procedure for notifying 

the principal inspector before using any 

approved AMOC on any airplane to 

which the AMOC applies. 

Change to Existing AD 

This proposed AD would retain the 

requirements of AD 99–08–04. Since AD 

99–08–04 was issued, the AD format has 

been revised, and certain paragraphs 

have been rearranged. As a result, the 

corresponding paragraph identifiers 

have changed in this proposed AD, as 

listed in the following table: 

REVISED PARAGRAPH IDENTIFIERS

Requirement in AD 

99–08–04 

Corresponding 

requirement in this 

proposed AD 

paragraph (a) ............ paragraph (f). 

paragraph (b) ............ paragraph (h). 

paragraph (c) ............ paragraph (j). 

Costs of Compliance 

This proposed AD would affect about 

167 airplanes of U.S. registry. The new 

actions of this proposed AD add no 

additional economic burden. The 

current costs for this AD are repeated for 

the convenience of affected operators, as 

follows: 

The modification takes about 4 work 

hours per airplane, at an average labor 

rate of $80 per work hour. The 

manufacturer states that it will supply 

required parts to the operators at no 

cost. Based on these figures, the 

estimated cost of the modification is 

$53,440, or $320 per airplane. 

The inspection takes about 2 work 

hours per airplane, at an average labor 

rate of $80 per work hour. Based on 

these figures, the estimated cost of the 

inspection is $26,720, or $160 per 

airplane, per inspection cycle. 

Authority for This Rulemaking 

Title 49 of the United States Code 

specifies the FAA’s authority to issue 

rules on aviation safety. Subtitle I, 

Section 106, describes the authority of 

the FAA Administrator. Subtitle VII, 

Aviation Programs, describes in more 

detail the scope of the Agency’s 

authority. 

We are issuing this rulemaking under 

the authority described in Subtitle VII, 

Part A, Subpart III, Section 44701, 

‘‘General requirements.’’ Under that 

section, Congress charges the FAA with 

promoting safe flight of civil aircraft in 

air commerce by prescribing regulations 

for practices, methods, and procedures 

the Administrator finds necessary for 

safety in air commerce. This regulation 

is within the scope of that authority 

because it addresses an unsafe condition 

that is likely to exist or develop on 

products identified in this rulemaking 

action. 

Regulatory Findings 

We have determined that this 

proposed AD would not have federalism 

implications under Executive Order 

13132. This proposed AD would not 

have a substantial direct effect on the 

States, on the relationship between the 

national Government and the States, or 

on the distribution of power and 

responsibilities among the various 

levels of government. 

For the reasons discussed above, I 

certify that the proposed regulation: 

1. Is not a ‘‘significant regulatory 

action’’ under Executive Order 12866; 

2. Is not a ‘‘significant rule’’ under the 

DOT Regulatory Policies and Procedures 

(44 FR 11034, February 26, 1979); and 

3. Will not have a significant 

economic impact, positive or negative, 

on a substantial number of small entities 

under the criteria of the Regulatory 

Flexibility Act. 

We prepared a regulatory evaluation 

of the estimated costs to comply with 

this proposed AD and placed it in the 

AD docket. See the ADDRESSES section 

for a location to examine the regulatory 

evaluation. 

List of Subjects in 14 CFR Part 39 

Air transportation, Aircraft, Aviation 

safety, Safety. 

The Proposed Amendment 

Accordingly, under the authority 

delegated to me by the Administrator, 

the FAA proposes to amend 14 CFR part 

39 as follows: 

PART 39—AIRWORTHINESS 

DIRECTIVES 

1. The authority citation for part 39 

continues to read as follows: 

Authority: 49 U.S.C. 106(g), 40113, 44701. 

§ 39.13 [Amended] 

2. The Federal Aviation 

Administration (FAA) amends § 39.13 

by removing amendment 39–11109 (64 

FR 16803, April 7, 1999) and adding the 

following new airworthiness directive 

(AD): 

Bombardier, Inc. (Formerly de Havilland, 

Inc.): Docket No. FAA–2006–25904; 

Directorate Identifier 2006–NM–077–AD. 


sroberts on PROD1PC70 with PROPOSALS
56072 Federal Register / Vol. 71, No. 186 / Tuesday, September 26, 2006 / Proposed Rules 

Comments Due Date 

(a) The FAA must receive comments on 

this AD action by October 26, 2006. 

Affected ADs 

(b) This AD supersedes AD 99–08–04. 

Applicability 

(c) This AD applies to Bombardier Model 

DHC–8–100, –200 and –300 series airplanes, 

certificated in any category; equipped with a 

flight compartment door installation having 

part number (P/N) 82510074–(*), 82510294–

(*), 82510310–001, 8Z4597–001, H85250010–

(*), 82510700–(*), or 82510704–(*); except P/ 

Ns 82510704–502 and 82510704–503. 

Note 1: (*) denotes all dash numbers. 

Unsafe Condition 

(d) This AD results from a determination 

that certain cockpit doors are no longer 

subject to the existing requirements. We are 

issuing this AD to prevent failure of the 

alternate release mechanism of the flight 

compartment door, which could delay or 

impede the evacuation of the flightcrew 

during an emergency. This failure also could 

result in the flightcrew not being able to 

assist passengers in the event of an 

emergency. 

Compliance 

(e) You are responsible for having the 

actions required by this AD performed within 

the compliance times specified, unless the 

actions have already been done. 

Modification 

(f) Except as required by paragraph (g) of 

this AD: Within 90 days after May 12, 1999 

(the effective date of AD 99–08–04), modify 

the lower hinge assembly and main door 

latch (Modification 8/2337) of the flight 

compartment door, in accordance with 

Bombardier Service Bulletin S.B. 8–52–39, 

Revision ‘‘D,’’ dated February 27, 1998; or 

Revision ‘‘H,’’ dated September 9, 2004. After 

the effective date of this AD, only Revision 

‘‘H’’ may be used for accomplishing the 

modification. 

(g) For airplanes on which the modification 

required by paragraph (f) of this AD was done 

before the effective date of this AD in 

accordance with Bombardier Service Bulletin 

S.B. 8–52–39, dated August 30, 1996; or 

Revision ‘‘A,’’ dated October 31, 1996: 

Within 90 days after the effective date of this 

AD, do the modification required by 

paragraph (f) of this AD in accordance with 

Bombardier Service Bulletin 8–52–39, 

Revision ‘‘H,’’ dated September 9, 2004. 

Inspection 

(h) Within 800 flight hours after doing the 

modification required by paragraph (g) of this 

AD: Inspect the hinge areas around the hinge 

pin holes of the flight compartment door for 

wear in accordance with Bombardier Service 

Bulletin S.B. 8–52–39, Revision ‘‘D,’’ dated 

February 27, 1998; or Revision ‘‘H,’’ dated 

September 9, 2004. After the effective date of 

this AD, only Revision ‘‘H’’ may be used for 

accomplishing the inspection. 

(1) If no wear is detected, or if the wear is 

less than or equal to 0.020 inch in depth, 

repeat the inspection thereafter at intervals 

not to exceed 800 flight hours. 

(2) If any wear is detected and its 

dimension around the hinge pin holes is less 

than 0.050 inch and greater than 0.020 inch 

in depth, prior to further flight, perform the 

applicable corrective actions specified in the 

service bulletin. Repeat the inspection 

thereafter at intervals not to exceed 800 flight 

hours. 

(3) If any wear is detected and its 

dimension around the hinge pin holes is 

greater than or equal to 0.050 inch in depth, 

prior to further flight, replace the worn 

hinges with new hinges in accordance with 

the service bulletin. Repeat the inspection 

thereafter at intervals not to exceed 800 flight 

hours. 

Credit for Actions Accomplished Previously 

(i) Modifications and inspections done 

before the effective date of this AD in 

accordance with Bombardier Service Bulletin 

S.B. 8–52–39, Revision ‘‘B,’’ dated July 4, 

1997; Revision ‘‘C,’’ dated September 1, 1997; 

Revision ‘‘E,’’ dated May 10, 1999; Revision 

‘‘F,’’ dated February 4, 2000; or Revision G, 

dated May 17, 2001; are considered 

acceptable for compliance with the 

modification and inspections required by this 

AD. 

Alternative Methods of Compliance 

(AMOCs) 

(j)(1) The Manager, New York Aircraft 

Certification Office, FAA, has the authority to 

approve AMOCs for this AD, if requested in 

accordance with the procedures found in 14 

CFR 39.19. 

(2) AMOCs approved previously in 

accordance with AD 99–08–04 are approved 

as AMOCs for the corresponding provisions 

of paragraphs (f), (g), (h), and (i) of this AD. 

(3) Before using any AMOC approved in 

accordance with § 39.19 on any airplane to 

which the AMOC applies, notify the 

appropriate principal inspector in the FAA 

Flight Standards Certificate Holding District 

Office. 

Related Information 

(k) Canadian airworthiness directive CF–

1996–20R4, dated August 10, 2005, also 

addresses the subject of this AD. 

Issued in Renton, Washington, on 

September 15, 2006. 

Kalene C. Yanamura, 

Acting Manager, Transport Airplane 

Directorate, Aircraft Certification Service. 

[FR Doc. 06–8233 Filed 9–25–06; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF THE TREASURY 

Internal Revenue Service 

26 CFR Part 1 

[REG–140379–02; REG–142599–02] 

RIN 1545–BC07; 1545–BB23 

General Allocation and Accounting 

Regulations Under Section 141 

AGENCY: Internal Revenue Service (IRS), 

Treasury. 

ACTION: Notice of proposed rulemaking 

and notice of public hearing. 

SUMMARY: This document contains 

proposed regulations on the allocation 

of, and accounting for, tax-exempt bond 

proceeds for purposes of the private 

activity bond restrictions that apply 

under section 141 of the Internal 

Revenue Code (Code) and that apply in 

modified form to qualified 501(c)(3) 

bonds under section 145 of the Code. 

The proposed regulations provide State 

and local governmental issuers of taxexempt bonds with guidance for 

applying the private activity bond 

restrictions. This document also 

provides notice of a public hearing on 

these proposed regulations. 

DATES: Written or electronic comments 

must be received by December 26, 2006. 

Requests to speak with outlines of 

topics to be discussed at the public 

hearing scheduled for January 11, 2007, 

must be received by December 26, 2006. 

ADDRESSES: Send submissions to: 

CC:PA:LPD:PR (REG–140379–02; REG–

142599–02), room 5203, Internal 

Revenue Service, PO Box 7604, Ben 

Franklin Station, Washington, DC 

20044. Submissions may be hand 

delivered Monday through Friday 

between the hours of 8 a.m. to 4:30 p.m. 

to CC:PA:LPD:PR (REG–140379–02; 

REG–142599–02), Internal Revenue 

Service, Crystal Mall 4, 1941 Jefferson 

Davis Hwy., 1901 S. Bell St., room 108, 

Arlington, Virginia 22202. Alternatively, 

submissions may be made electronically 

to the IRS Internet Site at www.irs.gov/ 

regs or via the Federal eRulemaking 

Portal at www.regulations.gov (IRS–

REG–140379–02). The public hearing 

will be held in the auditorium of the 

New Carrollton Federal Building, 5000 

Ellin Rd., Lanham, Maryland 20706. 

FOR FURTHER INFORMATION CONTACT: 

Concerning the proposed regulations, 

Johanna Som de Cerff (202) 622–3980; 

concerning submissions and the 

hearing, Kelly D. Banks, (202) 622–7180 

(not toll-free numbers). 

SUPPLEMENTARY INFORMATION: 


sroberts on PROD1PC70 with PROPOSALS